Apparatus for applying glue to wood shavings, fibers and similar cellulose containing substances

ABSTRACT

A method of and device for applying glue to wood shavings, fibers and similar cellulose containing substances, according to which the glue to be applied is circulated within the region of the cylindrical wall of a cylindrical mixing chamber while a deflector forming a zone of turbulence for the material being circulated extends into the circulating material, a feeding device for feeding dry glue into the mixing chamber leading into the range of action of the deflector.

United States Patent Liidige et al.

APPARATUS FOR APPLYING GLUE TO WOOD SHAVINGS, FIBERS AND SIMILAR CELLULOSE CONTAINING SUBSTANCES Inventors: Wilhelm Liidige; Fritz Ltidige; Josef Liicke, all of Paderborn; Wilhelm Schluter, Schwaney; Heinrich Beckschulte, Scharmede, all of Germany Assignees: Wilhelm Lodige; Fritz Lodige; Josef Lucke, all of Paderborn, Germany Filed: Jan. 2, 1973 Appl. No.: 320,590

Foreign Application Priority Data Dec. 31, 1971 Germany 2165878 US. Cl 259/25; 259/68 Int. Cl B01f 7/04 Field of Search 259/5, 6, 9, 10, 25, 26,

[ July 22, 1975 [56] References Cited UNITED STATES PATENTS 1,948,871 2/1934 Quehl 259/9 2,270,139 1/1942 Petway.... 259/25 3,466,015 9/1969 Lodige.... 259/25 3,492,388 1/1970 Knusel 264/122 3,650,510 3/1972 Ansel 259/9 Primary ExaminerRobert W. Jenkins Attorney, Agent, or FirmWalter Becker [57] ABSTRACT A method of and device for applying glue to wood shavings, fibers and similar cellulose containing substances, according to which the glue to be applied is circulated within the region of the cylindrical wall of a cylindrical mixing chamber while a deflector forming a zone of turbulence for the material being circulated extends into the circulating material, a feeding device for feeding dry glue into the mixing chamber leading into the range of action of the deflector.

24 Claims, 5 Drawing Figures APPARATUS FOR APPLYING GLUE TO WOOD SHAVINGS, FIBERS AND SIMILAR CELLULOSE CONTAINING SUBSTANCES The present invention relates to a device for applying glue to wood shavings, fibers or similar particles of cellulose containing substances such as wood, waste bagasse, etc., according to which there is provided at least one cylindrical mixing chamber in which the particles to which the glue is to be applied and which have a certain moisture, in the form of a shaving, or the like ring are circulated within the region of the cylindrical chamber wall.

In connection with the manufacture of wood shaving plates, usually substantially dry wood shavings are intermixed with liquid and are subsequently poured to form shaving fleece and finally pressed. After drying the pressed material, a shaving plate ready for use is obtained. Technologically, it is rather difficult in this connection to obtain a mixture for forming the shaving fleece, which mixture on one hand should contain a proper proportion of resin in the form of glue so that the plate will have the desired strength and quality, and on the other hand with regard to the pressing operation will not have any excessive moisture. These requirements can be met only incompletely or rather seldom, because also the liquid glue has with regard to its composition and consistency to meet certain concrete requirements from the mixing operation on.

Thus, it has been found that with a glue application in machines in which the glue is added in machines in the form of a liquid glue to the shavings in turbulence, a proportion of 50% solid resin and 50% water yields a good ditribution of the glue. The consistency of the glue liquid resulting from its composition is of particular importance because the intimate intermixture of glue liquid and shavings is obtained by a shaving against shaving friction in which connection the glue liquid when frictionally engaging the shavings is, so-to-speak, wiped all over so that a shaving with too high a glue component slides along shavings with too low a glue component thereby giving off glue as long as its surrounding due to lack of glue is able to pick up glue. It will be evident that the efficiency of this wiper effect and also the preceding glue distribution is dependent to a major extend from the consistency, especially the viscosity of the glue liquid.

Thus, the ratio of resin component to liquid component is predetermined to a great extent. The disadvantageous results of a necessary determination of this ratio become particularly evident when manufacturing weather and moisture-resistant plates or profiles of shavings as is the case, for instance, when preparing windows and outer paneling. For this purpose a proportion of from 25% solid resin in the finished shaving plate is necessary. With this percentage, in view of the necessary composition of the glue liquid of, for instance, 50% solid resin to 50% water an extremely high moisture component is obtained so that the plates when being subjected to the pressing operation are destroyed by the escape of the water vapor. However, also with a less high solid resin proportion in the manufactured plate, for instance of the water proportion inherent thereto will yield considerable drawbacks at least as to the employed method, inasmuch as the subsequent pressing operation has to be carried out very slowly in order to avoid damage.

The long pressing periods, however, considerably increase the application of devices and space requirement if a reduction in the production is to be avoided. With regard to these drawbacks, there exists the tendency to employ shorter and shorter pressing periods to which end, however, it is necessary to increase the temperature during the pressing operation while with too high water content there exists the danger that the plates burst in view of the fast escape of vapor.

it could be suggested to eliminate the disadvantageous binding of the solid-resin proportion to a corresponding water proportion in the glue liquid by feeding only a portion of the required solid-resin proportion in liquid form whereas another proportion is fed in solid form. With such a method it would be possible to operate with a glue liquid which has good wiping properties, but the quantity of which is determined by the optimum water content for the subsequent further processing. The thus usually greatly decreased proportion in synthetic resin is increased by a subsequent addition of dry powder to the desired extent without at the same time increasing the moisture to a disadvantageous extent. In particular when employing a drum mixing machine which produces a relatively fast circulating ring of mixing material for a continuous production of plates, industry has heretofore been unsuccessful in adding resin in powder form to the material pre-moistened, for instance, by the glue liquid so that a required homogeneous intermixing will be obtained.

The main reason for this failure is seen in the fact that the powder on one hand, and the shaving material on the other hand, which latter is moved in the mixing drum at high speed represent components which due to their physical properties are difficult to intermix.

When adding dry glue, the shaving must at its outer surfaces always be so moist that it picks up the powder or dust and causes the same to adhere thereto. If, however, the shavings are moist, also the drum walls and tools will be moist in view of the mixing operation. inasmuch as the glue dust is very hygroscopic, it thus adheres to the drum walls and tools. A deposit on the drum walls is furthermore favored by the fact that the volume weight of the glue in powder form is from 8 to 10 times greater than that of the shaving material so that there exists the danger of centrifuging the glue dust out and, in particular, that some glue lumps are formed. Such a deposit, especially on the drum walls builds up more and more so that after hours or days to build up it is so great that the mixture is blocked or jammed. These deposits can then be removed only by hammer and chisel. A considerable drawback of these drawbacks is also seen in the fact that from time to time some deposits with too high glue content may become detached and pass into the shaving material and are later pressed together with the shaving fleece thereby affecting the quality of the plates to such an extent that the plates are frequently useless.

When supplying glue powder similar to the glue liquid through the central shaft carrying the mixing tools, on one hand the above mentioned drawbacks will occur and on the other hand technical difficulties will be encountered in connection with the supply of the powder. Therefore, a feeding of the glue powder within the region of the drum wall would appear to be desirable. In such an instance, however, the above mentioned problems occur to an even greater extent because the powder added from the outside will from the very start be in the direct vicinity of the moist drum wall and will, more or less, directly after its addition be thrown or centrifuged against the drum wall where the above mentioned deposits will form to an even greater extent. Moreover, the conveying of the powder to the rotating ring of material becomes problematic, inasmuch as the strong air current outside of the ring which rotates at a speed of several meters per second forms a blocking zone for the downwardly moving powder.

Primarily on the basis of the above mentioned difficulties, an addition of dry glue to the shavings could not lead to a satisfactory result. Also, a mixing of the dry powder with the dry shavings prior to an admixture into the mixing machine or in premixing zones thereof was not successful because on one hand the dust particles which in view of the lacking moisture did not adhere to the shavings was at the start of the rotary movement centrifuged out very quickly so that a considerable demixing occurred while on the other handwhen the glue liquid part or liquid was added, the highly hygroscopic glue powder withdrew from the glue liquid a considerable quantity of water as a result of which the homogeneous intermixture was prevented by the described wiping effect and furthermore the glue lumps which formed brought about the above mentioned deposits in the machine.

It is, therefore, an object of the present invention to provide a device of the general type set forth above, by means of which it will be possible for increasing the resin proportion without simultaneously increasing the water proportion, to add to the ring of shaving material in a simple manner a resin proportion in powder form so that a good intermixture will be obtained while simultaneously preventing the formation of lumps.

These objects and other objects and advantages of the invention will appear more clearly from the following specification, in connection with the accompanying drawings, in which:

FIG. 1 diagrammatically illustrates a longitudinal section through the central portion of a mixing device according to the invention.

FIG. 2 represents a cross section through the mixing device of FIG. 1, said section being taken along the line 11-11 of FIG. 1.

FIG. 2a shows a modification of structure of FIG. 2 having cutout therewith.

FIG. 3 diagrammatically illustrates in a highly simplified manner a longitudinal section through a modified form of the device according to the invention.

FIG. 4 represents a section taken along the line IVIV of FIG. 3.

The above outlined objects of the present invention have been realized surprisingly by a construction which is characterized in that a deflector extends into the circulating flow of material which deflector forms a turbulent zone for the material while feeding means for the pulverous dry glue lead into the range of action of said deflector. By means of said deflector there are generated strong speed components of the shaving particles which are primarily directed perpendicularly with regard to the locally undisturbed direction of movement of the ring of shaving material so that the dry glue particles adhering to the moist shaving particles in high motion are at high speed and transverse to the undisturbed advancing direction of the ring of shavings transported into all layers of said ring where they are substantially homogeneously distributed when leaving the zone of turbulence. In view of the high speed of the shavings in the area of said turbulence, each individual shaving has only very briefly an opportunity to pick up a small bulence, the wood shavings themselves form the trans porting means for the individual glue particles whereby a complete and above all immediate mixing in of the individual glue particles into the shaving material is effected before after absorbing humidity at conglomeration of spatially not yet separated powder particles to lumps or the like can occur. The formation of an overpressure which might prevent the addition of glue or a sinking down of the powder onto the ring of shaving material within the region of turbulence is according to a particularly preferred design of the invention prevented by the fact that within the region of action of the deflector there is provided at least one venting zone of the cylindrical chamber. In view of the air carried along on and in the rotating ring of shaving material, which air backs up ahead of the deflector, there is advantageously provided a venting zone which when viewing the direction of flow or rotation of the material is located ahead of the deflector. Inasmuch as a static overpressure behind the deflector corresponds to the area of overpressure ahead of the deflector in view of the renewed increase in the flow velocity, the feeding device for the pulverous dry glue leads, according to a preferred embodiment into the mixing chamber behind the deflector when viewing in the direction of rotation of the material. As a result thereof, the pulverous material is already radially outside the rotating material subjected to a suction effect and without affecting or impeding the shavings is continuously fed to the extent to which the addition is desired. A disturbance of this important effect by overpressure areas which could build up behind the lower pressure zone is effectively prevented by the fact that in the direction of rotation of k the material behind the feeding-in area for the dry glue there is provided an additional venting zone. In each instance a disadvantageous influence exerted upon the lower pressure area, for instance, the pressure shocks periodically generated by cavitation turbulence will be prevented by the fact that for the rear confinement (when viewing in the direction of rotation of the material) of the feeding-in area for the dry glue, and if desired, for the front confinement for the rear venting zone there is provided an air non-permeable separating member. In this way, pressure variations in the low pressure area within the region of the feeding-in area for the dry glue are practically avoided so that the feed ing-in of the powder can be effected without temporary and local variations in a continuous and homogeneous manner aided by the suction effect.

The method for applying glue to wood shavings and the like, base material in connection with the continuous manufacture of shaving plates while applying the device according to the invention is characterized primarily in that the wood shavings in a manner known per se are intimately intermixed with a liquid glue of a consistency which permits a satisfactory wiping and distribution of the glue. The method according to the invention is furthermore characterized in that subsequently through the intervention of the feeding device a required or desired residual quantity of glue powder is added in dry form. In this way, independently of the required resin proportion, practically any desired quan tity of water in the shaving fleece may be preselected with regard to the requirements of the subsequent processing while it is limited in downward direction only by the required humidity of the mixing material whereupon the required quantity of liquid glue is determined in conformity with its composition.

Referring now to the drawings in detail, the mixing machine illustrated in FIG. 1 has on the left side with regard to the drawing where the feeding in of the shavings is effected, a loosensing-up chamber 10, in which by a fast rotation of the mass of shavings, for instance, by means of mixing tools rotating about a horizontal shaft there is formed a ring of material. This ring of material enters at 11 an adjacent mixing chamber 12 which likewise contains rotating mixing tools 13. The mixing tools 13 which also in the other chambers and embodiments as well as other corresponding parts are designated with the same reference numerals are each mounted on a shaft 14. The shaft 14 of the mixing chamber 12 has a feeding device for the liquid glue, which liquid glue is from the inside centrifuged to the rotating ring of material and split up. The liquid glue prior to this centrifuging passes through feeding pipes 15 which are provided with bores. In a post-mixing chamber 16, the complete wiping of the liquid glue is effected on the shavings by shaving against shaving friction. From the mixing chamber 16 the shaving material passes into a mixing chamber 17 in which dry glue powder is admixed in a manner set forth below. Connected to the mixing chamber 17 is a mixing chamber 18 in which a further homogenization is effected and from which the mixing material is withdrawn. Within the region of the mixing chamber 17 there is provided a deflector 19 which extends into the rotating flow of shaving material. According to the specific embodiment shown in the drawing, the deflector 19 comprises an impact plate 21 which is arranged substantially perpendicularly with regard to the direction of flow of the ring of material shown at 20. For purposes of generating an optimum impact effect, the impact plate 21 is arranged substantially parallel to the axis of rotation which means perpendicularly with regard to the drawing plane. Within the region of a venting zone 22 which in the direction of flow of the shaving material is located ahead of the impact plate 21 or the deflector 19, the air which is carried along by the flow of shaving material and which backs up ahead of the deflector 19 can escape from the mixing chamber 17 in the direction indicated by the arrow 23. Inasmuch as the underpressure areas which forms behind the impact plate 21 when looking in the direction of flow is particularly well suitable for feeding in and mixing in the glue powder or other pulverous material, a feeding device 24 for the pulverous material leads in at this point. The thus formed feeding-in area 25 for the pulverous material is followed by a further venting zone 26 when viewing in the direction of rotation of the flow of material 20. In the venting zone 26, above all that air can escape which was also drawn in at the feeding point 25 for the pulverous material and which above all during the deviation of the flow of shavings is pressed out when again impacting upon the round wall of the chamber. For the rear confinement of the feeding-in area 25 for the dry glue (when viewing in the direction of the flow 20 of the material) and simultaneously for the front continement for the rear venting zone 26 there is provided an air impermeable separating element 27, for instance, a partition or a separating plate. The separating element 27 which preferably extends to the radially outer region of the axially forming flow of material prevents any inteference with the uniform suction within the region of the feeding-in area 25. Furthermore, the suction effect within the region of the area 25 is aided by the strong air flow which occurs in view of the subsequent venting zone 26.

In a manner favorable from the standpoint of construction and manufacture, the feeding in area 25 for the dry glue and the venting zones 22 and 26 are arranged within the region of the radially inner opening at least of one shaft-line extension or shaft 28 of the mixing chamber 17. A particularly low quantity of material and short time of manufacture is possible due to the fact that the shaft like extension 28 is subdivided into three chambers 31, 32, 33 by partitions 29, 30 which are parallel to the axis of rotation. These three chambers comprise two lateral chambers 31 and 33 for feeding and an intermediate chamber 32 for the addition of a dry glue or another pulverous or granular material. The addition of dry glue or powder is aided by the fact that the shaft like extension 28 can structurally easily be realized in dropping direction directly above the mixing chamber 17. A further important simplification is obtained by the fact that the partitions 29 and 30 at their radially inner range carry or form the deflector 19 and the impact plate 21 and the separating member 27. The deflector 19 must at any rate extend into the circulating flow of material which means that it must not under all circumstances extend to a point inwardly of the drum inasmuch as the flow of material within the region of the device for adding the material will when leaving the drum wall imposing a certain direction of movement on the flow of material, move out of the range of the drum radius in the form of a tragectory parabola, and thus impacts upon the deflector 19 outside the circumference of the drum.

The air flow which is important for a proper function is furthermore aided considerably by the fact that the intermediate chamber 32 for adding the dry glue cross sectional wise tapers radially inwardly so that an injector like acceleration effect is exerted upon the pulverous material and the latter in greater independence from possibly occuring pressure variations in the low pressure area at the feeding in area 25 is fed in (arrow 34) spatially and time wise in a very homogenous manner. On the other hand, the lateral chambers 31 and 33 are so designed that from the feeding zones 22 and 26 they taper radially outwardly so that, in other words, likewise in the flow direction (arrows 23 and 35) in view of the acceleration of the flow of the narrowing cross sections and the inherent static pressure drop, a proper escape of the excessive air is aided and assured.

Principally, instead of the mixing tools 13 it is possible also to provide other tool types for rotating the flow of shaving material. However, in the specific embodiment shown, tools 13 are provided which rotate in the manner of a rake; said mixing tools 13 must pass by the stationary deflector 19. To this end, the impacting plate 21 extends at least onto the vicinity of the path of movement of the radially outer-most ranges of the mixing tools 13. In this way a sufficient quantity of shaving material is caught and on the other hand, it is possible to equip the impact plate 21 with a radially continuous inner edge. An increase in the turbulence can be obtained in a simple manner by providing the deflector 19 or the mpact plate 21 in any convenient manner with passage or cutouts for the passage of the mixing tools 13 so that the radially inner-most edge of the impact plate will be located within the path of movement of the mixing tools 13. p

The embodiment of the invention illustrated in FIG. 3 and 4 differs from that of FIGS. 1 and 2 primarily in that instead of providing mixing tools 13 on parallel shaft 14 adjacent to each other in mixing chambers 10, l2, 16, 17 and 18, in which instance the flow of material passes through openings 11 between the mixing chambers while various components are admixed from the opening up chamber to the post-mixing and homogenizing chamber 18, there is provided a single large mixing chamber 36 with a shaft 37 carrying the mixing tools 13 while the rotating flow of material moves in axial direction of the shaft 37. The addition of the shaving material is effected at the one axial end of the mixing chamber 36 through a feed shaft 38 into an opening up zone 39 from where the material moves axially into a mixing zone 40 in which the addition of the glue liquid is effected, then moves into a further zone 41 for post-mixing and wiping of the material to which liquid glue has been applied, and finally passes into a zone 42 in which in conformity with the mixing chamber 17 the addition of the granular material, namely the glue powder is effected.

From FIG. 4 it will be seen that also in this instance the operation of the shaft like extension 28 is unchanged and corresponds precisely to the above described construction. Similar reference numerals in this instance designate similar parts.

After the addition of the glue powder during which i in view of the fast admixing operation, a formation of lumps is prevented, a complete homogenization of the mixing material in the adjacent homogenizing or postmixing zone 43 is realized at the connection of which the finished mixed material can be withdrawn through a withdrawal shaft 44 for forming the shaving fleece.

When applying the invention which permits a proper continuous intermixing of hygroscopic pulverous material with a moist moving flow of material, the difficulties referred toin the introductory portion to the specification are eliminated which difficulties in connection with the manufacture of shaving plates are that with an application of glue exclusively by means of liquid glue, the water content of the shaving fleece becomes undesirably high. A disengagement of the solid-resin particle from the water component is effected by the fact that the wood shavings are intimately intermixed in a manner known per se with a glue liquid of a consistency which permits a satisfactory wiping and distribution and in a quantity which is dependent solely from the desired water content, this disengagement. is furthermore assured by the fact that subsequently through the feeding device 24 or the shaft like extension 28 of the mixing chamber 17, 36 a required residual quantity of glue powder is added in dry form.

Numerous tests have shown that particularly excellent results are obtained when half of the required total quantity of granular material is added to the mixing material in the dry form as glue powder. However, also with any other division of the solid-resin-proportion to be added to an addition in liquid and an addition in dry form, no lumps or other forms of deposits are present inasmuch as the homogenous and uniform addition in cooperation with the constant underpressure and thereby the uniform suction effect at the feeding in area 25 will assure a correspondingly uniform wetting of the shaving particles which whirl around in the region of the feeding in area 25. in addition thereto, the fast movement of the granulars of the powder with the wood shavings as transporting means to all possible areas of the ring of shaving material will bring about an instantaneous separation and saturation of the individual pulverous granulars so that there remains no opportunity for the formation of nests or lumps. The invention is also fundamentally suitable for adding other pulverous materials to a pourable material which circulates preferably in a horizontal modifications chamber into which the powder is to be admixed uniformly and without the formation of lumps.

It is, .of course, to be understood that the present invention is, by no means, limited to the particular showing in the drawings but also comprises any modications within the scope of the appended claims.

Whatwe claim is:

1. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combina-,

cluding at least one venting zone arranged within the range of action of said deflector means.

2. A device in combination according to claim 1, in which one venting zone is located ahead of the deflector means when looking in the direction of rotation of said agitating means.

3. Adevice in combination according to claim 1, in which the mouth of said conveying means is located behind said deflector means when looking in the direction or rotation of said agitating means.

4. A device in combination according to claim 1,

' which includes a second venting zone located behind 6. A device in combination according to claim 1, in,

which said deflector means ends short of the radially outer end of said agitating means.

7. A device in combination according to claim 1, in which said deflector means has a continuous radial inner edge.

8. A device in combination according to claim 1, in.

which said mixing chamber means includes a first mixing chamber for receiving liquid glue and a second mix-.

9 ing chamber for receiving dry glue, said second mixing chamber communicating with said first mixing chamber and being preceded by each latter when looking in the direction of movement of the contents of said first mixing chamber to said second mixing chamber.

9. A device in combination according to claim 1, in which said mixing chamber means is formed by a single longitudinal mixing chamber having a plurality of serially arranged mixing zones arranged one behind the other in the longitudinal direction of said mixing chamber and communicating with eadch other, said mixing chamber also including a rotatable shaft having said agitating means connected thereto and extending through all of said mixing zones, inlet means being provided at one end of said mixing chamber for feeding substance to be admixed into said mixing chamber, and outlet means being provided at the other end of said mixing chamber for withdrawing the finished mixed material.

10. A device in combination according to claim 1, in which said mixing chamber means includes: a plurality of individual mixing chambers arranged one behind the other with each mixing chamber communicating with the next following mixing chamber, a plurality of rotatable shafts respectively arranged in said mixing chambers, and a plurality of agitators respectively connected to said shafts for rotation therewith.

11. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, and conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, said deflector means including a baffle plate.

12. A device in combination according to claim 11, in which said baffle plate ends short of the radially outer ends of said agitating means.

13. A device in combination according to claim 11, in which said deflector means has a continuous radial inner edge.

14. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, and an air impermeable separating element which when looking in the direction of rotation of said agitating means forms the rear confinement for the feeding-in area for dry glue.

15. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture alone said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means. conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, and an air impermeable separating element which when looking in the direction of rotation of said agitating means forms the front confinement for the feeding-in area of the dry glue.

16. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, and a separating element for engagement with the radially outer range of the actually forming flow of the mixture in said mixing chamber.

17. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combina tion: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, and conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, said mixing chamber means having an extension in the form of a shaft with a radially extending inner opening and in which the mouth of said conveying means is located within the range of said extension.

18. A device in combination according to claim 17, in which said extension in the form of a shaft includes partition wall means arranged substantially parallel to the axis of rotation of said agitating means and dividing said shaft into two lateral chambers for venting and an intermediate chamber for the admixture of dry glue.

19. A device in combination according to claim 18, in which at least the intermediate chamber for the admixture of dry glue is in the drop direction located above said mixing chamber means.

20. A device in combination according to claim 18, in which the radially extending inner portion of said partition wall means includes an impact plate and a separating element for engagement with the radially extending outer range of the actually forming flow of the' mixture in said mixingchamber means.

21. A device in combination according to claim 18, in which said intermediate chamber cross-sectionally tapers radially inwardly, and in which the two lateral chambers cross-sectionally taper radially outwardly.

22. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, and conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said I mixing chamber means, that portion of said deflector means which extends into said mixing chamber means extendingalong a plane at least approximately perpendicular to the axis of rotation of said agitating means.

23. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, and baffle plate means extending into said mixing chamber means beyondthe circular path of the outermost edge of said agitating means and being provided with cutouts for the passage therethrough of said agitating means.

24. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and Y mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, and conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, said deflector means extending into said mixing chamber means beyond the circular path of the outermost edge of said agitating means and being provided with cutouts for the passage therethrough of said agitating means. 

1. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, and conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, said mixing chamber means including at least one venting zone arranged within the range of action of said deflector means.
 2. A device in combination according to claim 1, in which one venting zone is located ahead of the deflector means when looking in the direction of rotation of said agitating means.
 3. A device in combination according to claim 1, in which the mouth of said conveying means is located behind said deflector means when looking in the direction or rotation of said agitating means.
 4. A device in combination according to claim 1, which includes a second venting zone located behind the mouth of said conveying means when looking in the direction of rotation of said agitating means.
 5. A device in combination according to claim 1, in which said deflector means is arranged substantially parallel to the axis of rotation of said agitating means.
 6. A device in combination according to claim 1, in which said deflector means ends short of the radially outer end of said agitating means.
 7. A device in combination according to claim 1, in which said deflector means has a continuous radial inner edge.
 8. A device in combination according to claim 1, in which said mixing chamber means includes a first mixing chamber for receiving liquid glue and a second mixing chamber for receiving dry glue, said second mixing chamber communicating with said first mixing chamber and being preceded by each latter when looking in the direction of movement of the contents of said first mixing chamber to said second mixing chamber.
 9. A device in combination according to claim 1, in which said mixing chamber means is formed by a single longitudinal mixing chamber having a plurality of serially arranged mixing zones arranged one behind the other in the longitudinal direction of said mixing chamber and communicating with eadch other, said mixing chamber also including a rotatable shaft having said agitating means connected thereto and extending through all of said mixing zones, inlet means being provided at one end of said mixing chamber for feeding substance to be admixed into said mixing chamber, and outlet means being provided at the other end of said mixing chamber for withdrawing the finished mixed material.
 10. A device in combination according to claim 1, in which said mixing chamber means includes: a plurality of individual mixing chambers arranged one behind the other with each mixing chamber communicating with the next following mixing chamber, a plurality of rotatable shafts respectively arranged in said mixing chambers, and a plurality of agitators respectively connected to said shafts for rotation therewith.
 11. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, and conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, said deflector means including a baffle plate.
 12. A device in combination according to claim 11, in which said baffle plate ends short of the radially outer ends of said agitating means.
 13. A device in combination according to claim 11, in which said deflector means has a continuous radial inner edge.
 14. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, and an air impermeable separating element which when looking in the direction of rotation of said agitating means forms the rear confinement for the feeding-in area for dry glue.
 15. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture alone said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, and an air impermeable separating element which when looking in the direction of rotation of said agitating means forms the front confinement for the feeding-in area of the dry glue.
 16. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, and a separating element for engagement with the radially outer range of the actually forming flow of the mixture in said mixing chamber.
 17. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, and conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, said mixing chamber means having an extension in the form of a shaft with a radially extending inner opening and in which the mouth of said conveying means is located within the range of said extension.
 18. A device in combination according to claim 17, in which said extension in the form of a shaft includes partition wall means arranged substantially parallel to the axis of rotation of said agitating means and dividing said shaft into two lateral chambers for venting and an intermediate chamber for the admixture of dry glue.
 19. A device in combination according to claim 18, in which at least the intermediate chamber for the admixture of dry glue is in the drop Direction located above said mixing chamber means.
 20. A device in combination according to claim 18, in which the radially extending inner portion of said partition wall means includes an impact plate and a separating element for engagement with the radially extending outer range of the actually forming flow of the mixture in said mixing chamber means.
 21. A device in combination according to claim 18, in which said intermediate chamber cross-sectionally tapers radially inwardly, and in which the two lateral chambers cross-sectionally taper radially outwardly.
 22. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, and conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, that portion of said deflector means which extends into said mixing chamber means extending along a plane at least approximately perpendicular to the axis of rotation of said agitating means.
 23. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, and baffle plate means extending into said mixing chamber means beyond the circular path of the outermost edge of said agitating means and being provided with cutouts for the passage therethrough of said agitating means.
 24. A device for applying dry glue to shavings, fibers and similar cellulose containing substances, especially wood and waste bagasse, which includes in combination: mixing chamber means with cylindrical chamber wall means and rotating agitating means for receiving and mixing the cellulose containing substance with glue, and circulating the thus formed mixture along said cylindrical chamber wall means, deflector means extending into said mixing chamber means for creating a zone of turbulence in a mixture circulating in said mixing chamber means, and conveying means having its mouth located within said mixing chamber means within the range of stagnation action of said deflector means for feeding only pulverous dry glue into said mixing chamber means, said deflector means extending into said mixing chamber means beyond the circular path of the outermost edge of said agitating means and being provided with cutouts for the passage therethrough of said agitating means. 